That is weird! Every single time I tried it (at least 5 or 6 times!) it got it right! Never wrong! That's when I stopped and thought I'd see if someone knows the "trick!" Now, I did see that the numbers and symbols change each time you "try again." What's up with that? Someone figure it out!

Stephanie, Thanks for your comments and for adding me to your blogroll! My husband and I figured that whenever you add a two digit number together and subtract it from the original number you get a multiple of 9 and we noticed that even thought the symbols changed they were always the same for all the multiples of 9 (9, 18 27 etc...) Thanks for a the mind challenge. :)